Finding the Fourth Proportional to 1,012.61, 1,513.46 and 913.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.61 : 1,513.46 = 913.55 : x
2. Step 2: Convert to fraction form
   1,012.61/1,513.46 = 913.55/x
3. Step 3: Cross multiply
   1,012.61x = 1,513.46 × 913.55
4. Step 4: Simplify right side
   1,012.61x = 1,382,609.25
5. Step 5: Solve for x
   x = 1,382,609.25/1,012.61
6. Step 6: Final answer
   x = 1,365.40